AIX altinst_rootvg Post: 303035987

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Operating Systems AIX AIX altinst_rootvg Post 303035987 by bakunin on Tuesday 11th of June 2019 03:04:50 PM

06-11-2019

Registered User

I think, first an explanation what this "altinst_rootvg" is is in order:

When you are updating AIX there is always a non-zero chance of something going wrong so that you may want to roll back. With AIX 5.2 (IIRC - not sure about that) IBM introduced the "alternate disk installation". First, here is the principle:

- you start with a mirrored rootvg, where you have two disks. Each holding one mirror.
- you break up the mirror so that you have two identical copies
- then you update one with the new version while retaining the other as it is
- if everything goes right, the second (not updated) mirror is remirrored from the updated one so that you have a mirrored rootvg again (new version)
- if something goes wrong, reboot from the not-updated original, remirror the updated one from this so that you have a mirrored rootvg again (old version)

OK, with this in mind: notice that you first need to remove any installed emergency fixes before you update. Second, you do NOT do what i described above by hand! You use the adequate commands: alt_disk_install, alt_disk_copy, etc.. Read up on them before you attempt any update using them! There are options to alt_disk_install to create/remove the rootvg copies. Use only these, do NOT doctor with what the commands have created. Here is a link with the procedure.

Also notice that your NIM-server should ALWAYS be higher than or at least at the same level as your highest system. A NIM server with AIX 6.1 can only serve clients up to 6.1 and todays this means it is almost useless (AIX 6.1 is out of support in a few weeks). Your NIM-server should right now be at AIX 7.2 latest TL, even if the rest of your environment is 7.1 (which, btw., i think is a good idea). You can always serve clients below the NIMs level but never above.

I hope this helps.

bakunin

bakunin

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LEARN ABOUT SUSE

ssh-keysign

SSH-KEYSIGN(8)						    BSD System Manager's Manual 					    SSH-KEYSIGN(8)

NAME

     ssh-keysign -- ssh helper program for host-based authentication

SYNOPSIS

     ssh-keysign

DESCRIPTION

     ssh-keysign is used by ssh(1) to access the local host keys and generate the digital signature required during host-based authentication with
     SSH protocol version 2.

     ssh-keysign is disabled by default and can only be enabled in the global client configuration file /etc/ssh/ssh_config by setting
     EnableSSHKeysign to ``yes''.

     ssh-keysign is not intended to be invoked by the user, but from ssh(1).  See ssh(1) and sshd(8) for more information about host-based authen-
     tication.

FILES

     /etc/ssh/ssh_config
	     Controls whether ssh-keysign is enabled.

     /etc/ssh/ssh_host_dsa_key, /etc/ssh/ssh_host_rsa_key
	     These files contain the private parts of the host keys used to generate the digital signature.  They should be owned by root, read-
	     able only by root, and not accessible to others.  Since they are readable only by root, ssh-keysign must be set-uid root if host-
	     based authentication is used.

SEE ALSO

     ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)

HISTORY

     ssh-keysign first appeared in OpenBSD 3.2.

AUTHORS

     Markus Friedl <markus@openbsd.org>

BSD
								   May 31, 2007 							       BSD